Phosphorus fertilizer is a kind of quick-acting fertilizer. At present, there are many methods to identify true and false phosphorus fertilizers. There are mainly four identification methods: First, observe the color and morphology. The standard phosphate fertilizer is gray in color and its form is powdery. If the color is found to be white or yellow, it may be due to incomplete acid treatment and low phosphorus content. If the phosphate fertilizer has absorbed moisture, its quality has also been reduced. Second, smell the smell. The standard phosphate fertilizer has a slight acidity. If it is odorless, it means that the amount of sulfuric acid used in the production process is insufficient, the reaction is incomplete, and the active ingredient is low. If the sourness is too strong, it means that the free acid content is high, the fertilizer effect is low, and after use, it will also inhibit the activity of the soil microorganisms, burn the roots of the seedlings, and even cause the seeds to fail to germinate. Third, touch. In general, the standard phosphorus fertilizer has a water content of 8% to 14%, and feels cool after being touched, but it is water-free. If water is squeezed by hand, the water content is too high and the quality of the phosphate fertilizer is poor. If the hand touches dry soil, the acid treatment is not complete, and the effective phosphorus content is low. Fourth, sampling tests. Through the sampling test conducted by the designated department concerned, the effective content, the water content and the free acid content of the phosphate fertilizer are determined, so as to identify the true or false phosphorus fertilizer. China Agricultural Network Editor
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